<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>💗</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
            background: #000;
        }

        canvas {
            position: absolute;
            width: 100%;
            height: 100%;
        }

        #pinkboard {
            animation: anim 1.5s ease-in-out infinite;
            -webkit-animation: anim 1.5s ease-in-out infinite;
            -o-animation: anim 1.5s ease-in-out infinite;
            -moz-animation: anim 1.5s ease-in-out infinite;
        }

        @keyframes anim {
            0% {
                transform: scale(0.8);
            }
            25% {
                transform: scale(0.7);
            }
            50% {
                transform: scale(1);
            }
            75% {
                transform: scale(0.7);
            }
            100% {
                transform: scale(0.8);
            }
        }

        @-webkit-keyframes anim {
            0% {
                -webkit-transform: scale(0.8);
            }
            25% {
                -webkit-transform: scale(0.7);
            }
            50% {
                -webkit-transform: scale(1);
            }
            75% {
                -webkit-transform: scale(0.7);
            }
            100% {
                -webkit-transform: scale(0.8);
            }
        }

        @-o-keyframes anim {
            0% {
                -o-transform: scale(0.8);
            }
            25% {
                -o-transform: scale(0.7);
            }
            50% {
                -o-transform: scale(1);
            }
            75% {
                -o-transform: scale(0.7);
            }
            100% {
                -o-transform: scale(0.8);
            }
        }

        @-moz-keyframes anim {
            0% {
                -moz-transform: scale(0.8);
            }
            25% {
                -moz-transform: scale(0.7);
            }
            50% {
                -moz-transform: scale(1);
            }
            75% {
                -moz-transform: scale(0.7);
            }
            100% {
                -moz-transform: scale(0.8);
            }
        }

        #name {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            margin-top: -20px;
            font-size: 46px;
            color: pink;
        }
    </style>
</head>
<body>
<canvas id="pinkboard" width="1920" height="947"></canvas>
<div id="name">❤萌❤</div>
<canvas id="canvas" width="1920" height="947"></canvas>
<script type="text/javascript">
    const colors = [
        "#eec996",
        "#8fb7d3",
        "#b7d4c6",
        "#c3bedd",
        "#f1d5e4",
        "#cae1d3",
        "#f3c89d",
        "#d0b0c3",
        "#819d53",
        "#c99294",
        "#cec884",
        "#ff8e70",
        "#e0a111",
        "#fffdf6",
        "#cbd7ac",
        "#e8c6c0",
        "#dc9898",
        "#ecc8ba",
    ];
    let canvas = document.getElementById("canvas");
    let ctx = canvas.getContext("2d");
    let count = 1;
    let ww = window.innerWidth;
    let wh = window.innerHeight;
    let hearts = [];

    function init() {
        requestAnimationFrame(render);
        canvas.width = ww;
        canvas.height = wh;
        for (let i = 0; i < 100; i++) {
            hearts.push(new Heart());
        }
    }

    function Heart() {
        this.x = Math.random() * ww;
        this.y = Math.random() * wh;
        this.opacity = Math.random() * 0.5 + 0.5;
        this.vel = {
            x: (Math.random() - 0.5) * 4,
            y: (Math.random() - 0.5) * 4,
        };
        this.targetScale = Math.random() * 0.15 + 0.02;
        this.scale = this.targetScale * Math.random();
    }

    Heart.prototype.update = function (i) {
        this.x += this.vel.x;
        this.y += this.vel.y;
        this.scale += (this.targetScale - this.scale) * 0.01;
        if (this.x - this.width > ww || this.x + this.width < 0) {
            this.scale = 0;
            this.x = Math.random() * ww;
        }
        if (this.y - this.height > wh || this.y + this.height < 0) {
            this.scale = 0;
            this.y = Math.random() * wh;
        }
        this.width = 470;
        this.height = 400;
    };
    Heart.prototype.draw = function (i) {
        ctx.globalAlpha = this.opacity;
        ctx.font = `${180 * this.scale}px "微软雅黑"`;
        ctx.fillStyle = colors[i % 18];
        ctx.fillText(
            "❤萌❤",
            this.x - this.width * 0.5,
            this.y - this.height * 0.5,
            this.width,
            this.height
        );
    };

    function render() {
        ctx.clearRect(0, 0, ww, wh);
        for (let i = 0; i < 100; i++) {
            hearts[i].update(i);
            hearts[i].draw(i);
        }
        requestAnimationFrame(render);
    }

    init();
    window.addEventListener("resize", function () {
        ww = window.innerWidth;
        wh = window.innerHeight;
    });
</script>
<script>
    let settings = {
        particles: {
            length: 500,
            duration: 2,
            velocity: 100,
            effect: -0.75,
            size: 30,
        },
    };
    (function () {
        let b = 0;
        let c = ["ms", "moz", "webkit", "o"];
        for (let a = 0; a < c.length && !window.requestAnimationFrame; ++a) {
            window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"];
            window.cancelAnimationFrame =
                window[c[a] + "CancelAnimationFrame"] ||
                window[c[a] + "CancelRequestAnimationFrame"];
        }
        if (!window.requestAnimationFrame) {
            window.requestAnimationFrame = function (h, e) {
                let d = new Date().getTime();
                let f = Math.max(0, 16 - (d - b));
                let g = window.setTimeout(function () {
                    h(d + f);
                }, f);
                b = d + f;
                return g;
            };
        }
        if (!window.cancelAnimationFrame) {
            window.cancelAnimationFrame = function (d) {
                clearTimeout(d);
            };
        }
    })();
    let Point = (function () {
        function Point(x, y) {
            this.x = typeof x !== "undefined" ? x : 0;
            this.y = typeof y !== "undefined" ? y : 0;
        }

        Point.prototype.clone = function () {
            return new Point(this.x, this.y);
        };
        Point.prototype.length = function (length) {
            if (typeof length == "undefined")
                return Math.sqrt(this.x * this.x + this.y * this.y);
            this.normalize();
            this.x *= length;
            this.y *= length;
            return this;
        };
        Point.prototype.normalize = function () {
            let length = this.length();
            this.x /= length;
            this.y /= length;
            return this;
        };
        return Point;
    })();
    let Particle = (function () {
        function Particle() {
            this.position = new Point();
            this.velocity = new Point();
            this.acceleration = new Point();
            this.age = 0;
        }

        Particle.prototype.initialize = function (x, y, dx, dy) {
            this.position.x = x;
            this.position.y = y;
            this.velocity.x = dx;
            this.velocity.y = dy;
            this.acceleration.x = dx * settings.particles.effect;
            this.acceleration.y = dy * settings.particles.effect;
            this.age = 0;
        };
        Particle.prototype.update = function (deltaTime) {
            this.position.x += this.velocity.x * deltaTime;
            this.position.y += this.velocity.y * deltaTime;
            this.velocity.x += this.acceleration.x * deltaTime;
            this.velocity.y += this.acceleration.y * deltaTime;
            this.age += deltaTime;
        };
        Particle.prototype.draw = function (context, image) {
            function ease(t) {
                return --t * t * t + 1;
            }

            let size = image.width * ease(this.age / settings.particles.duration);
            context.globalAlpha = 1 - this.age / settings.particles.duration;
            context.drawImage(
                image,
                this.position.x - size / 2,
                this.position.y - size / 2,
                size,
                size
            );
        };
        return Particle;
    })();
    let ParticlePool = (function () {
        let particles,
            firstActive = 0,
            firstFree = 0,
            duration = settings.particles.duration;

        function ParticlePool(length) {
            particles = new Array(length);
            for (let i = 0; i < particles.length; i++)
                particles[i] = new Particle();
        }

        ParticlePool.prototype.add = function (x, y, dx, dy) {
            particles[firstFree].initialize(x, y, dx, dy);
            firstFree++;
            if (firstFree == particles.length) firstFree = 0;
            if (firstActive == firstFree) firstActive++;
            if (firstActive == particles.length) firstActive = 0;
        };
        ParticlePool.prototype.update = function (deltaTime) {
            let i;
            if (firstActive < firstFree) {
                for (i = firstActive; i < firstFree; i++)
                    particles[i].update(deltaTime);
            }
            if (firstFree < firstActive) {
                for (i = firstActive; i < particles.length; i++)
                    particles[i].update(deltaTime);
                for (i = 0; i < firstFree; i++) particles[i].update(deltaTime);
            }
            while (
                particles[firstActive].age >= duration &&
                firstActive != firstFree
                ) {
                firstActive++;
                if (firstActive == particles.length) firstActive = 0;
            }
        };
        ParticlePool.prototype.draw = function (context, image) {
            if (firstActive < firstFree) {
                for (i = firstActive; i < firstFree; i++)
                    particles[i].draw(context, image);
            }
            if (firstFree < firstActive) {
                for (i = firstActive; i < particles.length; i++)
                    particles[i].draw(context, image);
                for (i = 0; i < firstFree; i++) particles[i].draw(context, image);
            }
        };
        return ParticlePool;
    })();
    (function (canvas) {
        let context = canvas.getContext("2d"),
            particles = new ParticlePool(settings.particles.length),
            particleRate =
                settings.particles.length / settings.particles.duration, // particles/sec
            time;

        function pointOnHeart(t) {
            return new Point(
                160 * Math.pow(Math.sin(t), 3),
                130 * Math.cos(t) -
                50 * Math.cos(2 * t) -
                20 * Math.cos(3 * t) -
                10 * Math.cos(4 * t) +
                25
            );
        }

        let image = (function () {
            let canvas = document.createElement("canvas"),
                context = canvas.getContext("2d");
            canvas.width = settings.particles.size;
            canvas.height = settings.particles.size;

            function to(t) {
                let point = pointOnHeart(t);
                point.x =
                    settings.particles.size / 2 +
                    (point.x * settings.particles.size) / 350;
                point.y =
                    settings.particles.size / 2 -
                    (point.y * settings.particles.size) / 350;
                return point;
            }

            context.beginPath();
            let t = -Math.PI;
            let point = to(t);
            context.moveTo(point.x, point.y);
            while (t < Math.PI) {
                t += 0.01;
                point = to(t);
                context.lineTo(point.x, point.y);
            }
            context.closePath();
            context.fillStyle = "pink";
            context.fill();
            let image = new Image();
            image.src = canvas.toDataURL();
            return image;
        })();

        function render() {
            requestAnimationFrame(render);
            let newTime = new Date().getTime() / 1000,
                deltaTime = newTime - (time || newTime);
            time = newTime;
            context.clearRect(0, 0, canvas.width, canvas.height);
            let amount = particleRate * deltaTime;
            for (let i = 0; i < amount; i++) {
                let pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
                let dir = pos.clone().length(settings.particles.velocity);
                particles.add(
                    canvas.width / 2 + pos.x,
                    canvas.height / 2 - pos.y,
                    dir.x,
                    -dir.y
                );
            }
            particles.update(deltaTime);
            particles.draw(context, image);
        }

        function onResize() {
            canvas.width = canvas.clientWidth;
            canvas.height = canvas.clientHeight;
        }

        window.onresize = onResize;
        setTimeout(function () {
            onResize();
            render();
        }, 10);
    })(document.getElementById("pinkboard"));
</script>
</body>
</html>